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Audio and Video Talk
Valves / Vacuum Tubes
Does the Shape & Size of the Glass Valve make a Difference to the Sound ?
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<blockquote data-quote="Ufudu" data-source="post: 930784" data-attributes="member: 16901"><p>In support of Ampdog... (assuming we are not being trolled ;D):</p><p></p><p>I can only comment from a scientific/engineering perspective (as opposed to a metaphysical/spiritual/perceptive standpoint), (this engineering perspective being the same perspective that created the valves in the first place....)</p><p></p><p>As Fredeb noted, the anode/grid/cathode is essentially cylindrical in nature with the electrons moving from the cathode to anode from inside to outside, impacting the external anode and not getting anywhere near the glass envelope.</p><p></p><p>The electrical characteristic of the tube is determined by the mechanical design of the electrodes (anode/cathode/grid) structure which has to be VERY precise. During construction these components are all jigged together in various stages, and the support structure assembled. So, looking at a typical 300B, there is a mica disc at the top that acts as a primary support, and another disc below; the entire structure is cylindrical. This must now be placed into a glass tube and the base (a sintered glass base containing the pins) sealed onto the tube. The glass worker used to do this by hand on a glass lathe (in the olden days) and it was a work of art!</p><p></p><p>The primary variability between OEM tubes, replicas, and batch variation is due to the assembly process. Jigs wear out, tolerances increase, operators have differing skills, modern tubes are no longer using original tools & jigs etc etc.</p><p></p><p>The glass must provide support to the top mica support, but should be sufficiently clear of the hot anode, but again provide support at the bottom.</p><p></p><p>Thus the glass envelope, whilst providing an aesthetic pleasing structure, is that shape because of practical/mechanical requirements.</p><p></p><p>To suggest that the sound is influenced by the glass shape is perhaps like suggesting the earth is influenced by the shape of the universe.</p><p></p><p>It may be, but so far nobody has been able to measure this, and until they do, it simply remains that, a suggestion...</p></blockquote><p></p>
[QUOTE="Ufudu, post: 930784, member: 16901"] In support of Ampdog... (assuming we are not being trolled ;D): I can only comment from a scientific/engineering perspective (as opposed to a metaphysical/spiritual/perceptive standpoint), (this engineering perspective being the same perspective that created the valves in the first place....) As Fredeb noted, the anode/grid/cathode is essentially cylindrical in nature with the electrons moving from the cathode to anode from inside to outside, impacting the external anode and not getting anywhere near the glass envelope. The electrical characteristic of the tube is determined by the mechanical design of the electrodes (anode/cathode/grid) structure which has to be VERY precise. During construction these components are all jigged together in various stages, and the support structure assembled. So, looking at a typical 300B, there is a mica disc at the top that acts as a primary support, and another disc below; the entire structure is cylindrical. This must now be placed into a glass tube and the base (a sintered glass base containing the pins) sealed onto the tube. The glass worker used to do this by hand on a glass lathe (in the olden days) and it was a work of art! The primary variability between OEM tubes, replicas, and batch variation is due to the assembly process. Jigs wear out, tolerances increase, operators have differing skills, modern tubes are no longer using original tools & jigs etc etc. The glass must provide support to the top mica support, but should be sufficiently clear of the hot anode, but again provide support at the bottom. Thus the glass envelope, whilst providing an aesthetic pleasing structure, is that shape because of practical/mechanical requirements. To suggest that the sound is influenced by the glass shape is perhaps like suggesting the earth is influenced by the shape of the universe. It may be, but so far nobody has been able to measure this, and until they do, it simply remains that, a suggestion... [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Does the Shape & Size of the Glass Valve make a Difference to the Sound ?
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